Rotary pump



vJune 8., 1943. R ELUNWOOD 2,321,190I

ROTARY PUMP A Filed March 50. 1940 2 Sheets-Sheet 1 jimi 1 8 jfl-a2.

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ifi/1- June 8,v 1943. H. R. ELLlNwooD 2,321,190

ROTARY PUMP l Filed Manch EO, 1940 2` Sheets-Sheet 2 U 2% am,

Patented June 8, 1943 ROTARY PUMP Herman Ray. Ellinwood, Burbank, Calif., assigner to Adel Precision Products Corporation, Burbank, Calif., a corporation of California Application March 30, 1940, Serial No. 326,995

(Cl. S- 136) 3 Claims.

This invention relates to a pump and has for an object the provision of a novel pump which may be advantageously employed where a low powered, extremely small, simply constructed and comparatively inexpensive pump of light weight and capable of reliable performance in all positions and at all times, is desired, but which is especially designed for supplying anti-icing fluid to the propellers or other parts of an airplane for preventing ice formations on or the de-cing of such parts.

Another of the purposes of my invention is to provide a pump having the above noted features and qualities, wherein the parts and elements are of simple form and subject to being easily and inexpensively produced as well as quickly and easily assembled and disassembled.

A further purpose of my invention is to provide a pump such as described wherein a novel construction ,and arrangement of the parts thereof make possible a multiple or duplex pump actions with a single pump element without appreciably increasing the size, bulk or operating cost of the pump; the pump being equipped with a plurality of outlets, a single inlet, a single shaft and a single pump element which is adapted to serve the purpose of a plurality of pump elements.

The invention also comprehends the provision of a novel and simplified pump unit which comprises a simple disk-like cylindrical rotor, vconcentric with its driving shaft and disposed to rotate in an elliptical bore of a radially ported stator ring or cylinder, the outer periphery of which is concentric with the axis of the rotor; the rotor being provided with radial pumping vanes which contact the wall of the elliptical bore, and the stator ring being provided with dual outlet passages and a single inlet passage with a pair of inlet ports so associated with a pair of outlet ports that the single rotor will act to effect discharge of uid through the outlet passages to different points of discharge. This construction and arrangement reduces the cost of production and simplifies the construction of the parts as wel1 as the assembly and disassembly operations.

Another object is to provide a rotary pump includinga rotor and driving gear assembled on a single shaft, in which the parts are so arranged and housed as to insure against fluid being pumped from mingling with and deteriorating lubricant in which the driving gear and shaft bearings are packed.

A further object is to provide a unitary pump housing which is so formed as to afford a support and casing for an electrical motor, a lubricantl packed transmission gear housing, and a rotary pump housing, with said housings separated yet carried on the motor casing.

With the foregoing objects in view, together with such other objects and advantages as may subsequently appear, the invention is carried into effect as illustrated by way of example in the accompanying drawings, in which:

Fig. 1 is a, side elevation of a pump embodying by invention;

Fig. 2 is an enlarged vertical section taken on the line 2'2 of Fig. 1;

Fig. 3 is a sectional view taken onv the line 3-3 is made up of a. motor enclosing portion I I for' a motor I2, a pump rotor enclosing-housing I3, and a transmission gear housing I4 in which latter a reduction worm drive I5 connects the motor shaft I6 with a pump shaft Il. A single pump element I8 is mounted on the shaft Il and operates in the housing I3 which latter is provided with an inlet opening I9 to which a liquid supply line 20 is connected. A pair of outlet openings 2| and 22 are provided in the housing I3, and pipe lines 23 and 24 are connected with said outlets vfor supplying liquid to designated places, as for example, the propellers of a twin motored airplane. In this connection it sliould be noted that it is the present day practice to provide passages or bores in the hub and blades of a propeller for applying to the exterior surfaces of the propeller an anti-freezing or de-icing liquid. Hence the dual pump feature of the present invention provides for applying such a liquid to an airplane having two propellers, or to direct fluid to two different parts of the airplane.

In accordance with my invention the pump housing I3 is of substantially cylindrical form and mountedin the present instance in upright position but as will be apparent with reference to the drawings and the complete description thereof, could be disposed in any position. .As here shown the housing is formed with a cylindrical bore 25 which extends from the upper end of the housing where it is closed by a cap 26 to an end wall 21 having an opening 28 through which the shaft I1 loosely extends. The housing |4.is formed with a worm drive enclosing chamber 29 closed by a screw threadedcap 30, and is also formed With a recess 3| having an end wall 32 spaced from and paralleling the wall 21 and having an opening 33 through which the pump shaft I1 extends. A lubricant packed ball bearing 34 for the shaft I1 is housed in the recess 3|. At its lower end the shaft I1 is rounded and abuts the cap 38, and the upper end of the shaft is rounded and bears against the cap 26.

The slot or gap 35 between the Walls 21 and 32 serves to prevent leakage from the pump chamber in the housing I3 into the drive chamber within the housing I4; any leakage around the pump shaft running outwardly through the slot 35 rather than around the shaft I1 and through the wall 32 into the lower chamber. An annular packing member 36 surrounds the shaft I1 in a counterbore 31 in the wall 21 to check leakage, but should leakage take place the liquid will run out through the slot 35 as aforesaid.

The pump unit here shown comprises a cylindrical ring like -stator 3,8 having an elliptical bore 39, which stator is fitted into the cylindrical pump. chamber 25 as shown in Figs. 2v. 3, 4, and and is held in place between a pair of crowding rings 49 and 4| as shown in Fig. 2; said assembly being held in place by the screw cap 26 yet being readily removable axially of th'e pump chamber as are also the parts of the pump units when the cap 26 is removed.

The ring 38 is provided on its outer periphery with a circumferentially extending intake passage 42 which is arranged in registration with the inlet opening I9 of the housing I3, and which passage terminates in a pair of diametrically opposed intake ports 43 and 44 disposed on a plane perpendicular to a plane extending axially throughthe intake opening I9. A pair of circumferentially extending discharge passages 45 and 46 are'formed in the outer periphery of the ring 38, which passages lead from a pair of diametrically opposed but axially offset outlet ports 41 and 48, and which ports are disposed in slightly offset radial relation to the intake ports 43 and 44.

The inlet ports 43 and 44, and the outlet ports 41 and'48 open to the inner periphery'of the ring' 38 on opposite sides of a plane extending through'the minor axis a-a of the elliptical bore of the ring. The ring 38 is positioned with the major axis b-b of the elliptical bore thereof extending in slightly diagonal orvoblique relation to the diametrical plane c-c ofthe cylindrical chamber.25 of the housing I3 extending axially of the intake I9 and of the outlets 2| and places through the ports 41 and 48, passages 45l `22 which latte'r are spaced apart on such diaumetrical plane.

' forms the inner margins of said recesses.

and 46, outlets 2| and 22 and pipe lines 23 and 24.

A feature of the invention resides in the mode of forming the elliptical bore 39 of the stator ring and associating the rotor 49 therewith which feature is particularly .shown in Figs. '1 and 8 and consists in initially boring-the ring with a concentric circular bore having a diameter closely conforming to that of the rotor 49 with a radius d struck from a center point e located at the intersection of the minor and major axes a-a and b-b of the bore 39, whereby said bore 39 is formed with diametrically opposed arcuate or segmental portions 52 and 53 and which portions closely conform to opposed diametrical portions of the rotor 4when the latter is mounted in the stator. After forming the initial bore as above stated, and bores of corresponding diameters to said initial bore are formed with the radii thereof struck from center points f and g spaced equi-distant on opposite sides of the center point e on the major axis b-b of the bore 39; said end bores forming crescent shaped recesses 54 and 55 on diametrically opposed side portions of the rotor 49, the outer periphery of which rotor The tips of said recesses merge into the arcuate lines of contact of the rotor 49 with the segmental sections 52 and 53 of the inner periphery of the stator ring. By this formation a substantial length of contact will be afforded between the rotor and stator so as to insure sealing off of the recesses 54 and 55 from each other and. prevfollowing blade 5| will act to advance such volume of liquid to discharge through the port 48, passage 46 and outlet 22. The blade following the discharging blade just mentioned will then `pass the port 44 so as to effect intake of fluid rearward of such blade which fluid will be advanced by the then following blade and directed to discharge through the port 41, passage 45 and outlet 2|. To effect the operation above described the three blades 5| are spacedequi-distant around the periphery of the rotor and the several ports are arranged relative to the axes of the elliptical bore as before stated. Each of the blades thus serve to successively effect intake of uid through the port 43 and its discharge through the port 48 and also to successively effect intake of fluid through the port 44 and its discharge through the port 41.

It is important to note that the pump thereof is especially constructed and arranged to perform .faithfully with an extremely low pumping caner to prevent ice formations on such surfaces..

The pump may be eicaciously employed however for-any purpose wherein it is desired to continuously supply at a lowfrate to designated points a small quantity of liquid.

The particular construction and arrangement of the pump assures long life of the parts and reliable perfomance over long periods of time without servicing. However replacement of parts may be readily accomplished when necessary due to the particular construction and arrangement of the pump parts.

This replacement is facilitated as is the initial assembly of the parts, by reason of the opposed end caps 23 and 30 on being removed giving access to the interiors of the housings I3 and Il so that the gasket 36 may be readily placed in the recess 31 Yof the housing I3, and the bearing 34 positioned in the recess 3i of the housing Il. The shaft I'I may then be put in place whereupon the pump assembly including the disk II, ring 38, rotor I9 with its blades 50, and disk llmay be assembled around the shaft Il in the bore 25 of the housing I3, and the gear I applied to the shaft II in the bore 29 of the housing Il; the gear I5 and rotor 4! being keyed to the shaft in co1`1+ ventional fashion. The caps 26 and 3l on beingV- replaced will serve as end thrust bearings for the shaft I1.

I claim:

'1-. In a rotary pump, a pump housing having an inlet opening anda plurality of axially spaced outlet openings, a ring 'in said housing having an elliptical'inner peripheryvand formed with an externaarcuate groove forming a passage.

toward each other and connecting with theA ring, a plurality of blades on said rotor arranged to traverse said elliptical periphery, and means for rotating said rotor.

2. In a rotary pump, a pair of axially spaced housings formed with bores opening at the outer ends of the housings and having end walls opposed to each other and formed with internal recesses and mutually aligned openings, a shaft extending through said openings and projecting into said bores, a. bearing for said shaft inthe recess in one of said end walls, a drive gear on said shaft in one of said bores, a rotary pump assembly in the other of said bores including a rotor affixed to said shaft,. a. seal encompassing said shaft in the recess of the other of said end walls, and end caps screwed on said housings acting as en d thrust bearings for said shaft.

3. In a rotary pump, a pair of aligned housings, a web integral with and joining said housings in axially spaced relation with a gap between the opposed ends of the housings open to the atmosphere, said housings having bores extending through said opposed ends. a shaft common to said bores and housings extending through said opposed ends so as to be exposed in said gap te discharge leakage therein, Icaps at the outer ends of said housings and abutting the ends of the shaft, a bearingfor the shaft and a driving gear on the shaft both located in one of said housings, and a rotary pump struc'- ture operated by said shafts in the other of the housings.

' HERMAN RAY ELLINWOOD 

